Buck-boost switch circuit and control method thereof

A technology of boost control and switching circuit, which is applied to electrical components, conversion equipment without intermediate conversion to AC, and output power conversion devices, etc. The effect of convenience, small output voltage ripple, and simple circuit structure loop

Active Publication Date: 2015-08-05
CHENGDU MONOLITHIC POWER SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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In practical applications, the circuit structure ...

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  • Buck-boost switch circuit and control method thereof
  • Buck-boost switch circuit and control method thereof
  • Buck-boost switch circuit and control method thereof

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Embodiment Construction

[0027] Specific embodiments of the present invention will be described in detail below, and it should be noted that the embodiments described here are only for illustration, not for limiting the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one of ordinary skill in the art that these specific details need not be employed to practice the present invention. In other instances, well-known circuits, materials or methods have not been described in detail in order to avoid obscuring the present invention.

[0028] Throughout this specification, reference to "one embodiment," "an embodiment," "an example," or "example" means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in the present invention. In at least one embodiment. Thus, appearances of the phrases "in on...

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Abstract

The invention provides a buck-boost switch circuit. The buck-boost switch circuit adopts a fixed duration turn-on circuit or a fixed duration turn-off circuit to control switches in the buck-boost switch circuit. The turn-on circuit adopts the fixed duration turn-on circuit or the fixed duration turn-off circuit to control a buck switch pair in a buck mode, adopts the fixed duration turn-on circuit or the fixed duration turn-off circuit to control a boost switch pair in a boost mode and adopts the fixed duration turn-on circuit or the fixed duration turn-off circuit to control the buck switch pair and the boost switch pair in a buck-boost mode so that energy transmission between an input end and an output end of the buck-boost switch circuit is adjusted. The buck-boost switch circuit provided by the invention does not need to use a loop compensation circuit and has simple circuit structure. And, the various working modes of the buck-boost switch circuit provided by the invention can be convenient to switch, the seamless joint of the various working modes can be achieved, and the buck-boost switch circuit has the better transient characteristic.

Description

technical field [0001] The present invention relates to an electronic circuit, and more specifically, the present invention relates to a switch circuit and a control method thereof. Background technique [0002] The buck-boost switching circuit has three working modes: boost mode, buck mode and buck-boost mode. Normally, when the input voltage is higher than the output voltage, the buck-boost switching circuit works in buck mode; when the input voltage is lower than the output voltage, the buck-boost switching circuit works in boost mode; when the input voltage and output voltage When close, the buck-boost switch circuit works in the buck-boost mode. [0003] figure 1 A conventional buck-boost switching circuit 10 is shown. The buck-boost switch circuit 10 includes: a first power switch PA and a second power switch PB coupled between the input voltage Vin and ground; a third power switch PC and a fourth power switch PD coupled between the output voltage Vout and between ...

Claims

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Application Information

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IPC IPC(8): H02M3/10H02M1/14
CPCH02M3/1582H02M1/0022
Inventor 欧阳茜
Owner CHENGDU MONOLITHIC POWER SYST
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